If the recent NY Auto Show is any example, auto manufacturers seem to equate microcars and minicars with electric or hybrid power.
Most of the minicars on display (largely concept cars) were electrics or hybrids, with power cords openly displayed.
Mitsubishi's iMiEV Sport -- originally shown at last year's Tokyo Motor Show -- was prominantly displayed in the manufacturer's booth, and is described by Mitsubishi as:
"...the pinnacle of Mitsubishi Motors's environmental technology, the i MiEV SPORT maximizes the sporty possibilities of the zero-emissions electric vehicle. The high power and environmental performance of its electric motors make it an exhilarating drive that delivers superior environmental performance."